Added 10 October 2026 semi-official adjective Categories: Obscure Words adjective ! Definition from Wiktionary (CC BY-SA). More about semi-official at Wordnik → Where our words come from → Having some degree of official authority. Related Words: officialparastatalsemiofficialinformalunofficialsemi-formalco-officialex-officialformalhonorarysemigovernmentalpublic Back to today's word